4983298 | Cummins ISB 24V 5.9L Loaded Complete Reinforced New Cylinder Head | 3977221 No Core Required

New Cummins ISB 24V 4983298 Casting 5.9L Cylinder Head

Brand New Heavy-Duty Aftermarket Casting – Fully Loaded & Ready to Install

This is a brand new, fully loaded heavy-duty aftermarket cylinder head for Cummins ISB 24-valve 5.9L diesel engines. Engineered to eliminate factory design flaws, it features an upgraded reinforced casting with thicker internal walls in high-stress areas and a higher nickel content to maximize crack resistance. The cylinder head arrives completely assembled with premium valves, springs, retainers, valve locks, high-temperature Viton valve stem seals, and standard-size cam bearings for a direct, hassle-free installation.

🛠️ In-House Machining Process

• Debris-Free Preparation: Every new casting is chemically cleaned and blown out to remove all residual machining oils and manufacturing debris. This ensures your engine’s oiling system remains uncontaminated from the first start-up.
• In-House Precision Machining: Unlike “shelf-stock” heads, we perform all final machine work in-house. This includes final guide sizing and precision valve seat cutting to ensure perfect geometry and clearances.
• Pressure & Integrity Testing: To go beyond the factory standard, we pressure-test every head to 60 PSI. This verifies that the casting is free of porosity leaks or internal defects that could compromise the cooling system.
• Dimensional Inspection: Our technicians perform a multi-point inspection of the gasket-sealing surface. This ensures the head is perfectly flat and meets tight OEM tolerances for a flawless fit.
• Professional Assembly & Setup: Valvetrain components are installed and verified in a clean-room environment. Each head comes fully assembled with valves and springs, ready for a direct bolt-on installation.
• Vacuum-Seal Verification: Every intake and exhaust port is Vacuum Tested. This guarantees a 100% airtight seal between the valves and seats, ensuring maximum compression right out of the box.

📊 Technical Specifications

• Fits: Cummins ISB 24V 5.9L engines
• Displacement: 5.9L
• Year Range: 2004-Present
• Engine Type: Diesel, Electronic and Non-Electronic Variations
• Cylinders: 6
• Core Return Required
• Cummins ISB Cylinder Head Casting Numbers: 3965999, 3954670, 3957383, 3977221, 4931647, 4983298
• OEM Replacement Numbers: 3954673, 3957384, 3957385, 3957386, 3957408, 3957958, 3957959, 3958170, 3965998, 3968185, 3968186, 3969071, 3977222, 3977225, 3977226, 3977227, 3977228, 4895759, 4895765, 4931564, 4931645, 4933955, 4936081, 4955212, 4981626, 5282703, 5282721, 5361593
• Serial Numbers: 46642927, 46938142, 56989468, 57064832, 57094491, 57139028, 57160859, 57568764, 57593566, 57774152

🚘 Common Applications

Direct fit for Cummins 5.9L ISB 24V engines found in:

• Years: 2004–Present
• Fitment: Fits all electronic and non-electronic variations of the 24-valve 5.9L Cummins ISB engine.
• Vehicle & Equipment Types: Light/Heavy Duty Trucks, Medium Duty Commercial Trucks, and Industrial/Step Van Applications